15
CAUTION: The end of flushing hose of tank
regulator must be equipped with a hand
shut-off valve (Robinair No. 40380). Close
hand shut-off valve and adjust nitrogen regulator
to correct pressure before proceeding with
flushing procedure.
COMPRESSOR REPLACEMENT
CAUTION: NEVER install a new compressor
without first checking for possible system
contamination.
To check for contamination, obtain an oil sample from an
old compressor.
If oil has burned odor, but no color change or
residue follow instructions in section Installing A
New Compressor on page 14.
If oil has burned odor and shows contamination
(dark color) or feels gritty follow instructions in
next section, To Flush The System. Remove as
much contamination as possible from system
before installing new compressor.
To Flush The System
NOTE: The system should be flushed with dry
nitrogen. However, you must use R-22 if refrigerant
is used to flush system. This is the only refrigerant
that can be used to flush the system and it must be
recovered.
CAUTION: Use extreme care when using dry
nitrogen to flush systems. Pressure in nitrogen
cylinder could be as high as 2000 psi. Nitrogen
cylinder must be equipped with approved
pressure regulator and pressure relief valve.
Ensure that your hoses have adequate ratings
for pressure involved, and that all of your
equipment is in good condition.
leak testing, as flux can seal off pinhole leaks that would
show up later.
COMPONENT REPLACEMENT
CAUTION: It is extremely important to verify
the type of refrigerant in a system before
starting any sealed system repair. Check
serial plate for the correct refrigerant type
and charge.
When replacing components, all copper joints must be
joined with silver solder or Sil-Fos.
CAUTION: Be careful not to damage adjacent
parts when using a torch on soldered joints. If
necessary, use a metal heat shield, or wrap a
wet cloth around the tubing to reduce heat
transfer.
To Use Refrigerant To Flush The System:
CAUTION: Refrigerant used for flushing must
be captured in a recovery bag. Meter amount
of refrigerant used for flushing with your
charging cylinder. DO NOT OVERFILL THE
BAG.
1. Remove suction and discharge lines on compressor and
disconnect capillary tube from condenser. Connect pro-
cess coupling to outlet and inlet tube of condenser.
2. Connect hose to outlet process coupling and
charging cylinder. Connect another hose to inlet
coupling and recovery bag.
3. Open charging cylinder and allow refrigerant to flow
through condenser until discharge into bag is clear.
4. Connect process fitting to compressor suction line.
Flush evaporator and capillary tube.
NOTE: If unable to get refrigerant flow through
capillary tube, remove capillary tube from
evaporator and flush again.
5. If cap tube is blocked, replace cap tube.
6. Reassemble system.
Installing a New Compressor
All replacement compressors are shipped with rubber plugs in
the suction, discharge, and process tubes and contain the
correct oil charge and a holding charge of inert gas. Models with
Reciprocating Compressors have a low-side process tube
attached to the compressor shell. Models with Rotary
Compressors have a process tube on the high side of the
system soldered into the compressor discharge line
WARNING: DO NOT OPERATE COMPRESSOR
WHEN CHARGING LIQUID REFRIGERANT INTO
SYSTEM THROUGH ITS PROCESS TUBE.
Before installing the replacement compressor, remove the
discharge plug and check for the pop sound of the inert gas
leaving the compressor.
CAUTION: DO NOT use compressor if you do
not hear this sound.
A new compressor which is cold (e.g. after having been kept
in a cold service van) should be left to warm to the surrounding
temperature before the plugs on the compressor connections
are removed. This will help prevent condensation from forming
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